Blepharoplasty, or eyelid surgery is a surgical procedure that can improve the appearance of the eyelids. Blepharoplasty can be performed on the upper or lower lids, or both if desired. There are many reasons a patient may need or want eyelid surgery. For some it is simply a desire to improve their appearance. For others, it may be to correct functional problems they are experiencing, such as impaired vision because of sagging skin on their upper eyelid. Eyelid surgery can be used to treat a variety of conditions, including bags under the eyes, loose or sagging skin and skin that sags, causing blocked vision.